Efficiency and mechanism of Cu-FeOx@AC activated peroxymonosulfate system for algae removal
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Abstract:
A recyclable composite catalyst, Cu-FeOx@AC, comprising Cu-Fe bimetallic oxides loaded on granular activated carbon, was developed for exploring novel algal treatment technology in eutrophic water. The catalyst was prepared using hydrothermal and high-temperature calcination methods and characterized via XRD, SEM, FTIR and XPS. Investigations into the effects of Cu-FeOx loading ratio on AC, PMS quantity, initial pH, and different reaction systems were conducted to optimize algae removal. The study also explored the algae removal efficiency of the Cu-FeOx@AC activated PMS system. Free radical shielding experiments and XPS analysis were carried out to explore the reaction mechanism of the Cu-FeOx@AC activated PMS system. Results showed that at an initial pH of 6, initial algae concentration of 1.4×109 per liter, catalyst dosage of 0.2 g/L, and PMS dosage of 0.5 g/L, the algae degradation rate reached 97.25% within 90 min. In this system, algal cells were adsorbed onto Cu-FeOx@AC, facilitating valence conversion between Fe and Cu. The synergistic action of AC and the composite catalyst produced holes,·O2-,·OH,SO4-· and singlet oxygen, effectively removing algal cells.
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Supported by the Construction Science and Technology Project of Chongqing(No.2020.5-2).
